package com.chen.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.chen.reggie.common.CustomException;
import com.chen.reggie.mapper.CategoryMapper;
import com.chen.reggie.pojo.Category;
import com.chen.reggie.pojo.Dish;
import com.chen.reggie.pojo.Setmeal;
import com.chen.reggie.service.CategoryService;
import com.chen.reggie.service.DishService;
import com.chen.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * @ClassName CategoryServiceImpl
 * @Description TODO
 * @Author hainc
 * @Date 2022/9/4 20:33
 * @Version 1.0
 **/
@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {

    @Autowired
    private DishService dishService;
    @Autowired
    private SetmealService setmealService;



    /** 根据 id删除分类，删除之前需要判断
     * @date 2022/9/4
     * @param [id]
     * @return void
     **/
    @Override
    public void remove(Long id) {

        LambdaQueryWrapper<Dish> dishLambdaQueryWrapper = new LambdaQueryWrapper<>();
        //添加查询条件，根据分类id进行查询
        dishLambdaQueryWrapper.eq(Dish::getCategoryId,id);
        int count = dishService.count(dishLambdaQueryWrapper);

        //删除之前判断是否关联菜品，抛出一个业务异常
        if(count>0){
            //已经关联菜品，抛出业务异常
            throw new CustomException("当前分类下关联了菜品，不能删除");
        }

        LambdaQueryWrapper<Setmeal> setmealLambdaQueryWrapper = new LambdaQueryWrapper<>();
        //添加查询条件，根据分类id查询
        setmealLambdaQueryWrapper.eq(Setmeal::getCategoryId,id);
        int count1 = setmealService.count(setmealLambdaQueryWrapper);
        //删除之前判断是否关联套餐，抛出一个业务异常
        if(count1 > 0){
            //已经关联菜品，抛出业务异常
            throw new CustomException("当前分类下关联了菜品，不能删除");
        }

        //正常分类删除
        super.removeById(id);
    }
}
